CVE-2026-19489

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Buffer Overflow in Citrix NetScaler ADC and Gateway

Publication date: 2026-08-19

Last updated on: 2026-09-01

Assigner: NetScaler

Description

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-19

Last Modified

2026-09-01

Generated

2026-09-08

AI Q&A

2026-08-19

EPSS Evaluated

2026-09-07

NVD

CVE-2026-19489

EUVD

EUVD-2026-62394

Affected Vendors & Products

Vendor	Product	Version / Range
citrix	netscaler_adc	From 14.1 (inc) to 73.32 (inc)
citrix	netscaler_adc	From 13.1 (inc) to 63.21 (inc)
citrix	netscaler_gateway	From 14.1 (inc) to 73.32 (inc)
citrix	netscaler_gateway	From 13.1 (inc) to 63.21 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-120	The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Citrix NetScaler ADC and NetScaler Gateway affecting specific versions. The issue allows remote attackers to potentially execute arbitrary code or cause a denial of service due to unspecified flaws in the affected products.

Detection Guidance

This vulnerability affects Citrix NetScaler ADC and Gateway versions 14.1 through 73.32 and 13.1 through 63.21. To detect it, check the installed version of NetScaler ADC or Gateway using commands like 'show version' in the CLI. If the version falls within the affected range, the system is vulnerable.

Impact Analysis

An attacker could exploit this to gain unauthorized access, execute malicious code, or disrupt services. Systems running vulnerable versions of NetScaler ADC or Gateway are at risk of compromise, leading to potential data breaches or service outages.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations may face compliance violations, fines, or legal consequences if exploited.

Mitigation Strategies

Update NetScaler ADC and NetScaler Gateway to versions beyond the affected ranges (14.1 through 73.32 and 13.1 through 63.21). Apply patches or upgrades as soon as possible to address the vulnerability.

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